Grounding and bonding on the Texas journeyman exam, and the split that decides the item

What the exam does with it

Our question bank runs to 500 items and 66 of them sit in the grounding and bonding area, which is a little over 13 percent of it. Those 66 also run harder than the bank average, with 47 of them written at the top two difficulty levels against 332 of 500 across every area.

The published content outline is drawn along different lines, and knowing that saves you a wrong assumption. The journeyman NEC Knowledge portion has 56 scored items pulled from ten named subject areas, and the word grounding appears in none of their titles. Services, service equipment and separately derived systems carries six of those items. Grounding content arrives inside that area and inside wiring methods, equipment and devices, and special occupancies, so it reaches you from several directions in one sitting.

Pace matters here more than on most topics. That portion gives you 130 minutes for the 59 items you actually sit, about 2.2 minutes each, and a grounding item you have to reason out from first principles will eat four of them. You'll buy that time back by arriving able to sort the item in one read, which is what the rest of this page builds. The clock itself is covered under using the code book and exam day.

The sentence that settles most items

Article 250 opens with performance requirements, and 250.4(A)(5) decides the largest share of these items. It describes the effective ground-fault current path, and it asks that path to be low impedance, to carry the maximum fault current likely to be imposed on it back to the supply source, and to operate the overcurrent device. For the 2026 edition it breaks into three lettered pieces, and the third piece places the earth outside that path.

Stated as a positive, the rule puts fault clearing on bonded metal running back to the source of the circuit. Soil carries a few amperes where a device needs hundreds, so an enclosure connected to a driven rod and to nothing else sits energized with the breaker closed, and it'll look perfectly ordinary the whole time.

Two words with separate jobs

Both words carry one-line definitions in Article 100, and both definitions are narrower than the trade habit around them.

• Bonding describes a connection made so that electrical continuity and conductivity are established between conductive parts. The earth plays no part in it.
• Grounding describes a connection to ground, or to a conductive body that extends the ground connection.
• Ground is defined as the earth, and that two-word definition is the whole reason the first two stay apart.

So bonding is about continuity between metal parts and grounding is about a connection to the planet. One conductor can do both jobs, which is why the words blur on a job site, and an exam item is always aimed at one of them.

The equipment grounding conductor is where this costs people points, because its name says grounding and its job is bonding. Article 100 describes it as part of the effective ground-fault current path, tying normally non-current-carrying metal parts of equipment together and back to the system grounded conductor or the grounding electrode conductor. Thirty-two of the 66 area items name that conductor, so the habit of reading its name as its job is one the exam keeps testing.

Sorting an item from the stem

The useful question is which of the two jobs the thing in the item is doing, and the tell is where the conductor lands.

• A conductor that ends on an electrode, or that ties electrodes to each other, belongs to the earth side and sizes from 250.66. That is the subject of the page on the grounding electrode conductor.
• A conductor that carries fault current toward the source belongs to the fault-path side, and depending on where it sits the size comes from 250.122, from Table 250.102(C)(1), or from the service bonding methods at 250.92.
• An item about continuity across a fitting, a reducing washer or a concentric knockout is a fault-path item whatever the parts in it are called.

Sorting on the word in the answer choice fails, and it's the expensive direction to fail in. 250.66 sizes the jumpers that connect electrodes to each other, and those carry bonding in their name while sizing on the earth side. A supply-side bonding jumper at 250.102(C) carries bonding in its name and sizes on the fault-path side. Run the far-end test on both and each one comes out right, so use the job the conductor does and leave its label alone.

The same test separates the two conductors candidates mix up most often, which the page on the equipment grounding conductor takes apart in detail.

The wrong answers people pick

Every item in the bank carries a line on each wrong answer naming the mistake that produces it. Read across the 66 and a handful of mistakes account for most of them.

The second row carries a Texas wrinkle worth holding on to. The candidate bulletin instructs you to leave code exceptions aside unless the item directs you to one, and the 25 ohm release is written as an exception under the supplemental electrode requirement. When the bank wants you to use it, the stem hands you a measured reading, and that's your signal the exception is the subject of the question.

Two words one letter apart

Two Article 100 terms sit one letter apart and name conductors with opposite duty cycles.

The grounded conductor is a circuit conductor that has been intentionally grounded, and it carries return current every time the load runs. On a branch circuit it is the white one. The equipment grounding conductor carries current only while a fault is on the circuit, and it comes green, green with yellow stripes, or bare.

Calling the white wire the grounding conductor is the field habit that produces the violation. Landing one where the other belongs puts normal load current onto metal that people touch, which is what 250.6 calls objectionable current. Two items in the area put a clamp meter on metal that should be carrying nothing at all. In one the cause is a neutral to ground connection made at a downstream panel, and in the other it is an open connection in the service grounded conductor on the utility side, with load current using the electrode and the piping to get home.

The first of those has a page of its own here, because the bank calls it the most common grounding violation there is and gives it a large share of this area. See where the neutral and ground bond for the single point rule and for what a second bond does to a building.

What the split costs on the job

Two failures follow from getting this split wrong, and they look nothing alike.

The first one is silent. An enclosure with a connection to earth and no bonded path back to the source sits energized while the breaker stays closed, and the work looks correct from the outside. It passes a visual walk, and the condition shows itself when somebody puts a hand on that enclosure while touching something else that is grounded.

The second one announces itself if you're looking for it. A neutral to ground connection past the service hands building metal a share of the load current, and a clamp meter on a water line between two structures reads amperes with everything working normally and nothing faulted. The cure is separating the bars at the downstream panel, and the water line bond stays right where it is.

On the licensing side, 16 TAC 73.53 puts compliance with applicable codes and ordinances on every person performing electrical work, and Tex. Occ. Code 1305.301 lets the executive director impose an administrative penalty for violating a rule adopted under the chapter, whether or not the person holds a license. TDLR publishes an enforcement plan that sorts violations into four classes with stated ranges, and the ceiling in Tex. Occ. Code 51.302(a) runs to $5,000 per day for each violation. Our page on how TDLR enforces sets out the classes and the five factors that set the figure.

What to do before test day

Four moves, all of them finished before you walk in.

1. Read 250.4(A) and 250.4(B) in your own code book, in place, once. They run in near-identical wording for grounded and ungrounded systems, and reading them together is what makes the detailed sections behind them fall into order.
2. Tab 250.4, 250.66 and Table 250.122. Texas allows only tabs that the publisher of the code book manufactured or provided, so a set of index flags you cut yourself gets turned away at the door.
3. Mark the book at home. Highlighting, underlining and notes written in beforehand are allowed, and marking the book during the session is barred, so everything you want in there goes in the week before.
4. Drill the far-end test until it runs without thought. Cover the answer choices, decide whether the conductor in the stem heads for earth or heads back to the source, and open the book only after that.

Texas exams reference the code as adopted, and from September 1, 2026 that is the 2026 edition under 16 TAC 73.100, which our page on which code edition applies works through. For the code reading and the arithmetic worked line by line, grounding and bonding covers the same ground. Thirty timed questions are waiting at the free practice set.

Questions people ask

What is the difference between grounding and bonding?

Article 100 gives each word its own one-line definition. Grounding is a connection to ground, and ground is defined as the earth. Bonding is a connection made so that electrical continuity and conductivity are established between conductive parts, with the earth playing no part in it. The jobs follow from those definitions. Grounding holds the system at a stable reference and limits the voltage that lightning or a crossed line can push it to. Bonding builds the metal path that carries fault current back to the source so an overcurrent device opens. On an exam item, decide which of those two jobs the conductor in the stem is doing.

Does a ground rod clear a ground fault?

A driven rod is a connection to earth, and fault clearing happens on bonded metal. NEC 250.4(A)(5) describes the effective ground-fault current path as running from the point of the fault back to the supply source, and for the 2026 edition the use of the earth sits in its own lettered piece that places soil outside that path. Soil resistance runs to tens of ohms where a device needs hundreds of amperes to open quickly. An enclosure tied to a rod alone stays energized, and the breaker won't see a thing. The rod earns its place by limiting the voltage that lightning or a crossed line can push the system to.

How much of the Texas journeyman exam covers grounding?

The published content outline for the NEC Knowledge portion names ten subject areas and prints an item count beside each, and those areas are drawn along different lines, so grounding content arrives inside services and separately derived systems, which carries six of the 56 scored items, and also inside wiring methods, equipment and devices, and special occupancies. Our own question bank puts 66 of its 500 items in the grounding and bonding area, about 13 percent, and 47 of those 66 are written at the top two difficulty levels. Treat it as a topic that reaches you from several areas at once.

Is the equipment grounding conductor a grounding or a bonding conductor?

By job it is a bonding conductor, and by name it carries the word grounding. Article 100 describes it as a conductive path that is part of the effective ground-fault current path, joining normally non-current-carrying metal parts of equipment together and back to the system grounded conductor or the grounding electrode conductor. That describes continuity between metal parts, which is the definition of bonding, and an informational note under the definition says the same thing in as many words. Thirty-two of the 66 grounding items in our bank name this conductor, so reading its name as its job is a habit the exam will find.

What does the 25 ohm figure actually decide?

It decides whether a single rod, pipe or plate electrode needs a second electrode beside it. NEC 250.53(A)(2) requires the supplement as the general case, and an exception releases you where that one electrode measures 25 ohms or less to earth. Article 250 asks no grounding electrode system anywhere to reach 25 ohms, so a high reading calls for another electrode and it creates no violation on its own. Five items in our grounding area mention a resistance in ohms, and each one turns on that direction. The Texas candidate bulletin also tells you to leave exceptions aside unless the item points you at one.

How should I tab Article 250 before test day?

Start with 250.4, because the performance requirements explain what everything behind them is trying to accomplish. Add 250.66 for the earth side, Table 250.122 for the fault-path side, and 250.50 for what belongs in the electrode system. Texas allows only tabs that the publisher of the code book manufactured or provided, so buy a published set and skip the index flags. Highlighting, underlining and notes written into the book beforehand are allowed, and marking it during the session is barred, so it's all done at home. A soft-bound copy is required and the handbook edition stays on your shelf.